From: Yong Shen <yong.s...@linaro.org>
Signed-off-by: Yong Shen <yong.s...@linaro.org>
---
clocks.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 55 insertions(+), 1 deletions(-)
diff --git a/clocks.c b/clocks.c
index dc5c03b..25588f7 100644
--- a/clocks.c
+++ b/clocks.c
@@ -16,12 +16,18 @@
#include <stdio.h>
#include <mntent.h>
#include <sys/stat.h>
+#include <sys/inotify.h>
+#include <poll.h>
#include "powerdebug.h"
#include "clocks.h"
#define MAX_LINES 120
+static int inotify_fd;
+static int inotify_wd;
+static struct pollfd fds;
+
static char clk_dir_path[PATH_MAX];
static int bold[MAX_LINES];
static char clock_lines[MAX_LINES][128];
@@ -58,11 +64,56 @@ int clock_init(void)
if (locate_debugfs(clk_dir_path))
return -1;
+ inotify_fd = inotify_init();
+ if ( inotify_fd < 0 ) {
+ fprintf(stderr, "inotify_init error.\n" );
+ return -1;
+ }
+
+ inotify_wd = inotify_add_watch(inotify_fd, clk_dir_path,
+ IN_ALL_EVENTS );
+
+ fds.fd = inotify_fd;
+ fds.events = POLLIN;
+
sprintf(clk_dir_path, "%s/clock", clk_dir_path);
return access(clk_dir_path, F_OK);
}
+#define EVENT_SIZE ( sizeof (struct inotify_event) )
+#define BUF_LEN ( 10 * ( EVENT_SIZE + 16 ) )
+
+static int debugfs_changed(void)
+{
+ int length, i = 0;
+ char buffer[BUF_LEN];
+
+ if (inotify_fd <= 0) {
+ return 1;
+ }
+
+ poll(&fds, 1, 1);
+ if (fds.revents != POLLIN) {
+ return 0;
+ }
+
+ length = read(inotify_fd, buffer, BUF_LEN);
+
+ if (length < 0)
+ return 0;
+
+ while (i < length) {
+ struct inotify_event *event = (struct inotify_event *)
&buffer[i];
+ if (event->mask & IN_ALL_EVENTS)
+ return 1;
+
+ i += EVENT_SIZE + event->len;
+ }
+
+ return 0;
+}
+
static int file_read_from_format(char *file, int *value, const char *format)
{
FILE *f;
@@ -379,7 +430,8 @@ static int clk_number_recursive(char *clk_path)
static int get_clk_number(char *clk_path)
{
- if ((max_clk_num != 0)) /* no nodes have been added */
+ /* no nodes have been added */
+ if ((max_clk_num != 0) && (!debugfs_changed()))
return max_clk_num;
else {
max_clk_num = 0;
@@ -429,6 +481,8 @@ static void release_all_clk_info_mem(void)
void clock_finalize(void)
{
release_all_clk_info_mem();
+ inotify_rm_watch(inotify_fd, inotify_wd);
+ close(inotify_fd);
}
--
1.7.0.4
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